不同自然地带杉木林的生物生产力

本文对不同自然地带杉木林的生物生产力进行了比较，结果表明：中带(相当于中亚热带)生产力最高，其后依次为南带(相当于南亚热带)和北带(相当于北亚热带)。

The Biological Productivity on Chinese fir Stands at Different Zone

The distribution area of Chinese fir was divided into 3 zones, they are northern, central and southern zone.1. The standing crop of stand, the standing crop and net production of tree layer were respectively 156.31 ton/ha, 150.85 ton/ha and 10.34 ton/ha/yr for 20 years old at central zone (Hui-tong), 134.63 ton/ha, 127.92 ton/ha and 8.4 ton/ha/yr for 20 years old at southern zone (Yu-lin), and 103.63 ton/ha, 100.32 ton/ha and 4.8 ton/ha/yr, for 23 years old at northern zone (Xin-yang). Those data show that biological productivity of central zone is higher than other zones. So that central zone may be set up as the commercial timber forest base in China. Other zones may be used as the regional commercial timber forest base.2. Standing crop ratios of leave to branch and photosynthesis system to non photosynthesis system trended to wards southern zone>central zone>northern zone. Those indicated that standing crop of leave in southern zone is lower and its photosynthesis efficiency is higher than that of central zone and northern zone. Thick crown type may be chosen in southern one and thin crown type in northeen for afforesting.